Bulletin d’avalanche

Northwest Coastal

Apr 11 – 12, 2025Avalanche Canada
Voir sur la carte
Archivé · expiré last year

Danger d’avalanche

Sun
Mon
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
Ouvrir la carte complète

Points saillants

Forecasted snowfall amounts are highly variable, assess your local field conditions and if new snowfall accumulations exceed 20 cm bump your danger rating to CONSIDERABLE.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3.5

    Several weak layers persist in the snowpack. These layers are most likely to be reactive at upper elevations where no surface crust has formed. Surface instabilities or large triggers may step-down to these deeper layers.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2

    Expect wind slab development on north aspect terrain, near and below ridge crests.

Confidence

Moderate

Avalanche Summary

Over the past week, explosive-controlled avalanches up to size 3 have been reported daily, involving cornice failures, wind slabs, and wet loose.

Last Friday, a failing cornice triggered a size 3 avalanche on an eastern slope in the alpine. This avalanche is believed to have occurred on the March 5th surface hoar layer.

Where a thick, supportive surface crust is found, we expect that triggering avalanches on buried weak layers is unlikely.

Snowpack Summary

5 to 25 cm of new snow sits on variably wind affected snow in open terrain at upper elevations. A crust is found up to 1800 m and higher on solar slopes.

Three layers of note currently exist in the upper-mid snowpack.

  • A layer of surface hoar and a crust that formed in mid-March can be found 50 to 80 cm below the snow surface.

  • Another layer of surface hoar that formed in early March can be found at a depth of 70 to 120 cm.

  • A layer of facets, surface hoar, and/or a crust from mid-February is buried 120 to 200 cm deep.

The remainder of the snowpack is well consolidated, and there are no current concerns.

Weather Summary

Friday Night

Mostly cloudy with up to 5 cm of snow. 20 to 40 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 900 m.

Saturday

Mix of sun and cloud with flurries. 10 to 30 km/h southwest ridgetop wind. Treeline temperature -3°C. Freezing level 1000 m.

Sunday

Mix of sun and cloud with flurries. 10 to 30 km/h southwest ridgetop wind. Treeline temperature -3°C. Freezing level 1000 m.

Sunday

Mix of sun and cloud with flurries. 10 to 30 km/h southwest ridgetop wind. Treeline temperature -3°C. Freezing level 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Be aware of the potential for large, destructive avalanches due to deeply buried weak layers.
  • Cornice failures could trigger large and destructive avalanches.
  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.

Régions couvertes